Sales are not capacity
Virginia's commercial electricity sales have risen quickly as data centers concentrate in the state, but annual sales describe delivered energy rather than the maximum load the grid must serve at one time. Annual electricity sales measure delivered energy, while PJM peak load measures the maximum electricity demand that resources and reserves must serve.
The EIA makes that distinction explicit by pairing commercial sales with peak load in PJM's Dominion zone. Load-serving entities need resources and reserves for hourly, daily, and seasonal spikes while also supporting a steadily higher level of electricity use across the service territory.
Dominion becomes the planning benchmark
PJM expects the Dominion zone to post the largest absolute increase in summer peak demand across its transmission areas, largely because of data-center load. The zone already serves an unusually dense data-center market, supported by fiber connectivity, land, and established power infrastructure.
That density creates both scale and concentration. Each additional facility enters a region where average hourly load and seasonal peaks are already moving upward, so a new campus must be evaluated against the same generation, transmission, and reserve resources used by the rest of the zone.
Peak load changes the solution
PJM's Dominion zone must plan resources and reserves for hourly, daily, and seasonal spikes as data-center electricity demand rises. Peak demand requires resources that are available in the critical hour, which makes demand response, energy storage, spare interconnection capacity, and infrastructure updates more valuable than their annual energy contribution alone would suggest.
Data-center load forecasting also becomes an operating tool rather than a planning appendix. Utilities need to know when a facility will connect, how quickly it will ramp, whether it can reduce demand, and how cooling requirements interact with the weather that already drives the regional peak.
Operational inputs improve the forecast
A phased data-center load forecast helps PJM and Dominion plan generation, transmission, demand response, energy storage, and infrastructure updates. Existing facilities with spare interconnection capacity may also gain value when updates can add dependable supply faster than entirely new infrastructure.
Projects face peak-load exposure when commercial electricity sales grow faster than deliverable generation and transmission capacity. The tighter question is whether the Dominion zone has deliverable generation and transmission capacity during the same period in which new data-center load and extreme weather raise demand together.
Make the forecast operational
PJM's Dominion forecast needs the connection date, expected load ramp, and peak demand of each proposed data center. It should also show any demand response or storage that can reduce the site's contribution to a seasonal peak.
That information lets the utility distinguish energy demand from dependable capacity demand. A facility that reaches peak demand gradually produces a different hourly load forecast from one that reaches its peak demand at once.
It also exposes dependencies that a sales forecast cannot show. Transmission work, generation additions, infrastructure updates, and operating reserves each follow their own schedule. The project is credible only when those schedules can support the hour in which data-center load, cooling demand, and the rest of the Dominion zone reach their highest combined requirement.
Forecast boundaries
A key limitation is that PJM's peak demand projection depends on uncertain data-center deployment, technology, weather, and electricity use. Proposed data-center load can change as facilities are delayed, resized, or operated differently before reaching peak demand. PJM projects the Dominion zone's largest absolute increase in summer peak demand, with data-center load driving much of the increase.
Even so, the direction of the hourly data is hard to ignore. Recent hourly peak loads provide planning history, while PJM forecasts determine future resource, reserve, transmission, storage, and demand-response needs.
Bottom Line
Peak demand is the operating test.
Virginia commercial electricity sales have increased as data centers concentrate in the Dominion zone. The decisive planning document is the hourly load curve: which projects arrive, how they ramp, what flexibility they offer, and which grid resources are available when the Dominion zone reaches its next peak.
